<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>404 Not Found</title>
  <style>
    body {
      background-color: #f2f2f2;
      font-family: Arial, sans-serif;
      margin: 0;
      padding: 0;
    }

    .container {
      max-width: 500px;
      margin: 0 auto;
      text-align: center;
      padding: 40px;
      margin-top: 100px;
      background-color: #ffffff;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    }

    h1 {
      color: #333333;
      margin-top: 0;
    }

    p {
      color: #999999;
      margin-bottom: 30px;
    }

    a {
      color: #4CAF50;
      text-decoration: none;
    }

    a:hover {
      text-decoration: underline;
    }
  </style>
</head>
<body>
<div class="container">
  <h1>404 Not Found</h1>
  <p>用户不存在！</p>
</div>
</body>
</html>